fix app.json extraction in dockerfile apps not using /app. closes #2300
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@@ -13,7 +13,8 @@ Common use cases include:
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Dokku accomplishes this by using an `app.json` file. The format in use is similar to format of Heroku's [app.json](https://devcenter.heroku.com/articles/app-json-schema).
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However, dokku currently only supports the nodes `scripts.dokku.predeploy` and `scripts.dokku.postdeploy`.
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Simply place an `app.json` file in the root of your repository or for dockerfile apps, `ADD` it to /app.
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For buildpack apps, simply place an `app.json` file in the root of your repository.
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For dockerfile apps, place `app.json` in the configured `WORKDIR` directory; otherwise dokku defaults to the buildpack app behavior of looking in `/app`.
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>NOTE: postdeploy changes are *NOT* committed to the app image.
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### Example app.json
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